Devin Barclay never played in LA, but he did play in MLS, and there is an LA Times article featuring him, among others, talking about his struggles with ADD. Barclay maintains that the commonly prescribed drug Ritalin hindered his soccer development, even as it helped him focus in school.
Barclay is now out of the game at a professional level and back in school, going to college.
Another hyperactive kid is now playing for the Galaxy, after a concerned psychiatrist recommended soccer. Wonder what might have happened if he'd suggested Ritalin instead?